Chemical Equilibrium: One-Page Formula Sheet

Chemical Equilibrium — formula sheet

Formulas

• Kp = Kc(RT)^Δn
• K for reversed reaction = 1/K; multiplied by n → Kⁿ
• ΔG° = −RT ln K
• Van 't Hoff: log(K₂/K₁) = ΔH°/(2.303R)(1/T₁ − 1/T₂)

Key ideas

• At equilibrium forward and backward rates are equal
• Q < K: reaction goes forward; Q > K: backward
• Only temperature changes the value of K
• Pure solids and liquids are not written in K

Traps to avoid

• Including solids in K
• Thinking pressure or catalysts change K
• Wrong Δn in Kp–Kc relation

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